Does Google have an || (or)? Particularly for searching particular sites?

Say I wanted to search site:wordpress.com site:livejournal.com gelato. Doesn’t work, because it tries to && those results instead of ||ing them. Say I want to do this for a number of sites such that it makes sense not to not restrict but also large enough so that it would be tedious to do this for every site (perhaps four or more specific site searches). How do I get the || of results for site:livejournal.com gelato and site:wordpress.com gelato?

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Author: JohnnyApplesauce